import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 高生平
 * Date: 2025-09-12
 * Time: 20:57
 */
public class Test {

    public static double average (int[] array) {
        int sum = 0;
        for (int x : array) {
            sum += x;
        }
        return (double) sum / (double) array.length;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int k = sc.nextInt();
        int[] array = new int[k];
        for (int i = 0; i < k; i++) {
            array[i] = sc.nextInt();
        }
        System.out.println(average(array));
    }
}
